The problem is none of your solutions are viable either. Even if they were executed the results are usually negligible. In fact most of your solutions end up making us feel better about ourselves. But this is all illusion.

For these huge environmental problems humanity is facing, I'm sorry to say the only way it to do huge drastic unrealistic changes that will never occur because humanity doesn't have the will power to pull it off.

The real honest answer is that there no "solutioning" the worst case scenario will likely play out.